Raveger says "Forced Response: After Raveger form the Deep is committed to a story wound all other characters committed to that story". So, if you are the active player and commit RftD and then commit more characters, does the RftD response trigger and then the others go unwounded? Or does the commitment take place all at once and then the others are wounded as well?

commitment is all at once.

So that means the active player would self-wound all characters committed with RfoD? Sounds correct, as I think the 'spirit' of this card is defensive.

Yes, Raveger from the Deep is a defensive character.

Yes, the ravager is to be avoid if commited on a team !! He's a single defensive character ...

or commit it with your invulnerable characters or those with thoughness....or may be with your living mummy (CS_F104) if you want to do funny combo.